Wardrobe: nurse white mini skirt but nothing on the head and some button open to see your cleavage. Nude legs and mules. Room: medical room and chair 0-3 min: You enter in the laboratory as my older step-sis. You see me standing up but tied. Not nude but in only a towel. (Like after shower). You sit on a chair. Sexy cross legs. Calm down little step-brother, trust me. Let me explain. You see, our guardians agreed to allow me to use you for some research. I'm collecting data on the male adolescent reproductive system. I'm checking the volume of semen production and hormone levels mostly. I already approved the test for you. I forged your signature. You see I have many friends who need to get pregnant and I'm sure you will be a perfect "papa" 3-6 min: You take out my towel (see the towel). My penis remains soft. By purposely dropping a pen, I discover that you wearing no panties. And that you leaning forward you do not have a bra. You see I'm erect. 6-9 min: You show me a glass cylinder. It's time for the extractor little step-bro laughing You set the extractor on my penis and push a button on the remote control to start. Ready to become a papa? Don't worry if you don't need to hold your cum...but the extractor is very efficient for that. I bet with the other nurse that you cannot hold for long. 9-12 min: I try to fight. But you don' t help me. Cross and uncross your sexy legs and lean forward to coerce me to show your cleavage. I don't cum and you decide to accelerate the process. 12-15 min: You decide to start a striptease. When you are nude, I come. You show me the glass with my semen (simulate with white liquid). Finally not so difficult and you leave the laboratory. Big step-sis steals your sperm in an embarrassing fashion!